Orange mineral and method of manufacturing same.



emes. -1il'o'lDrawing.

ii -sans JOHN A. SCHAEFFER, OF'JOPLIN,' MISSOURI, ASSIGNOE TO FIGHTER LEAD COMPANY,

01E OPLIN, MISS OURI A CQRPQRATION OF MISSOURI.

. onene s MINERAL AND METHGD or MANUFACTURING SAME.

. To all whom it may concern: p Be it known that L'JOHN A. SoHAErrER, a citizen of the United 'State s of America, residing in the city of J'oplin, in the county of Jasper, State of Missouri, have invented a certain new and useful'Tmprovement in Orange Mineral and Method of Manufac-' and'many of .its physical characteristics,

may properly be called orange mineral, but whieh differs fromthe.known orange min,- eral of commerce in that it has a much finer state of division andla considerably less weight per unit'ofbulk and I believe both the material and method of .manufact ur1ng the same to be new with'me.

' HeretofOre orange mineral which, al-

though chemically the same, is distinguished X from red lead by its color and texture, has been madeby-the decomposition of corroded white leadand .the subsequent re-oxidati0n of thisproduct, and my invention is based on my discovery that a product haviilg the color peculiarities of and an even finer amorphous texture than'the nrange mineral heretofore known, can be manufactured by subjecting volatili zed or furn d litharge to an oxidizing calcination who will convert the monoxid into tetroxid and my invention accordingly consists, in the first place,in the, method of: manufacturing my new .orange'. mineral which consists in subjecting volatilized or-fumed litharge to an oxidizing calcinationat a proper temperature,

I manufactured from the volatil-ized litharge which I have ascertained to be approximately 850 F. and, inthe second place, my invention consistsin the new orange mineral and characterized day-a finer state of subdivision and a lesswe'ight in unit 'of bulk than previously known varieties of orange mineral. I

l The substanceT have referred to as 'vola- 'tilized litharge is the product of the volatilization of .inelted litharge, monoxid of lead, condensed and collected, preferably by passing the volatilized oxidthrough a cool ing system and finally into a' bag room where the condensed oxid' fume is separated from the furnace gases. Forthis purpose the oxidation.

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i Specification ofLetters Patent. Pw'gqgnitggd Jung 2U, 916, Application filed September 24:, 1915. $eria1No. 52,465.

apparatus similar to that employed in the manufacture of sublimed white lead is conveniently employed.

The oxidation of the volatilized or fumed litharge is conveniently carried on in ordi nary types of reverberatory furnaces such as are used in the manufacture'of red lead and orange mineral from massicot and the product of decomposed white lead or lead carbonate. I have found in practice that temperature of approximately 850 F.

gives the best result. The oxidation will of course take place at lower temperatures with less speed and it is necessary to avoid a temperature so high as to tend to reconvert the tetroxid into litharge. It will be understood that the mass should be stirred by any convenient means to promote the rapidity of The color of the product obtained from the volatilized litharge in. the manner described'will depend on the percentage of Pb O in the finished product which may of manufacturing-orange mineral, by vary- 1 ing the period to which the material is subected to the oxidizing calcination, but in all cases the texture of the new orange mineral will be found to be finer than that of the orange mineral manufactured before the hereindescribed orange mineral was dis covered, and its weight per cubic inch materially less,

I have found that a cubic inch of my new orange mineral will weigh from 9 to 11 grams while orange mineral as heretofore made by old methods will weigh from 20 to 25 grams per cubic inch; The fineness of division of my new orange mineral in comparisonwith the older products of orange mineral bears about the same ratio which all: pigments formed by a fumed process bears to. pigments which are mechanically ground, itJis not possible to get even an -,app roximate'state of sub-division by mechanical grinding as compared with the subdivision secured by a fume process. The great difference infineness results in the important practical advantage that with my be varied, as in previously known methods newforange mineral 12 to. 14 pounds ground in oil will give a paint of proper painting consistency while theolder orange minerals ofcoarserconsistencymust be used in the proportion 0f 20 to 24 pounds to a gallon of oil to produce a'paint of the same painting consistency.

The gram weights per cubic inch referred to above are those obtained by the use of the Scott volumeter with the Schaeifer- \Vhite modification in the regularly prescribed operation of this volumeter. \Vhile the orange mineral prepared bythis process shows a gram weight and fineness as above stated, it would be possible to vary the fineness to a certain extent by changing the settling system so as to obtain either a finer or a coarser fumed litharge which would of course result in a finer or. coarser orange mineral with greater or less weight per cubic weight and a corresponding change in the weight required to give a paint of the proper painting consistency.

Having now described my invention, what a finer division and less weight per unit of bulk than known varieties of orange mineral 'made by the decomposition of corroded white lead and its subsequent reoxidation.

. JOHN A. scHAE'FFER. 

